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Capital Disclosure of investment grade credit rating (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Investment [Line Items] |  |
Comparable funds from operations to adjusted interest coverage, actual | 4.2 | 4.5
Adjusted comparable funds from operations to adjusted net debt, actual | 18.30% | 19.00%
Adjusted net debt to comparable earnings before interest, taxes, depreciation, and amortization, actual | 3.9 | 3.9
Deconsolidated net debt to deconsolidated comparable EBITDA, actual | 460.00% | 420.00%
Percentage of dividends added to comparable FFO before Interest to adjusted interest coverage | 50.00% |
Percentage of preferred shares added to net debt in Adjusted Comparable FFO to Adjusted Net Debt | 50.00% |
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From EBITDA to Adjusted Net Debt Ratio | 50.00% |
Minimum |  |
Investment [Line Items] |  |
Range of times to maintain percentage of dividends added to comparable FFO before Interest to adjusted interest coverage, as a multiple | 4 |
Percentage of preferred dividends deducted from Adjusted Comparable Funds From Operations to Adjusted Net Debt Ratio, Range to Maintain | 2000.00% |
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From Operations to Adjusted Net Debt Ratio, Range to Maintain | 3.0 |
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From EBITDA to Adjusted Net Debt Ratio, Range To Maintain Expressed As A Multiple | 2.5 |
Maximum |  |
Investment [Line Items] |  |
Range of times to maintain percentage of dividends added to comparable FFO before Interest to adjusted interest coverage, as a multiple | 5 |
Percentage of preferred dividends deducted from Adjusted Comparable Funds From Operations to Adjusted Net Debt Ratio, Range to Maintain | 2500.00% |
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From Operations to Adjusted Net Debt Ratio, Range to Maintain | 3.5 |
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From EBITDA to Adjusted Net Debt Ratio, Range To Maintain Expressed As A Multiple | 3.0 |

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